[docs] Add Apache Doris 4.1.4 release info (#4128)

## Summary

Publish Apache Doris 4.1.4 as **Latest** on `/download/` and
`/releases/`.

- Add 4.1.4 to `ALL_VERSIONS` as the newest patch of the 4.1 branch,
with x64, x64-noavx2 and arm64 rows. Source filename version is
`4.1.4-rc04`, matching the 4.1.3 precedent (`4.1.3-rc02`).
- Add synchronized English and Chinese release notes, generated from
[apache/doris#67355](https://github.com/apache/doris/issues/67355).
- Update both Doris Core indexes (`releasenotes/core.md` and its zh-CN
mirror): Latest tip plus the `2026-09-10` chronological entry.
- Add `v4.1/release-4.1.4` to the release sidebar.

`ACTIVE_CORE_BRANCHES` is unchanged — 4.1 is already maintained and
first, so `ACTIVE_HEADS` picks 4.1.4 up for the quick download card.

## Release metadata

| | |
|---|---|
| Public version | 4.1.4 |
| Source filename version | `4.1.4-rc04` |
| Source directory |
`https://dist.apache.org/repos/dist/release/doris/4.1/4.1.4/` |
| Release date | 2026-09-10 |
| Position | latest |
| Branch change | none |

## Known follow-up: source tarball not yet in the dist release repo

All **nine binary artifacts are live**, but the three source artifacts
still return 404:

```
https://dist.apache.org/repos/dist/release/doris/4.1/4.1.4/apache-doris-4.1.4-rc04-src.tar.gz{,.asc,.sha512}
```

`dist/dev/doris/4.1/4.1.4-rc04/` and
`downloads.apache.org/doris/4.1/4.1.4/` are also empty. The links start
working as soon as the RC is moved into the release repository — no
further website change is needed.

## Validation

Bilingual release notes are structurally identical: 24 headings, 194
bullets, 199 issue references in the same order.

- `node --test
doc-tools/skills/add-release/scripts/validate-release.test.mjs` — 6/6
passed
- Full validator — 62 checks passed, 3 failed (only the three
unpublished source URLs above)
- Same validator with `--skip-links` — 53 checks passed
- `sidebarsReleases.json` JSON parse check
- `git diff --check` — clean

```
node doc-tools/skills/add-release/scripts/validate-release.mjs \
  --component doris-core --version 4.1.4 --series 4.1 \
  --source-version 4.1.4-rc04 --release-date 2026-09-10 --position latest \
  --source-dir https://dist.apache.org/repos/dist/release/doris/4.1/4.1.4/
```

## Build

`yarn build` was not run, per request. `yarn typecheck` reports 179
errors on this branch, but the error set is byte-identical to the
`upstream-apache/master` baseline — all pre-existing, none in
`src/constant/download.data.ts`.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_01UsK6ae9vCwo5pREfu6iMBq

Co-authored-by: morningman <moringman@apache.org>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>